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Old 12-19-2018, 05:38 PM
 
1,817 posts, read 4,238,577 times
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Hi Everyone...Just wanted to announce a scheduled launch tonight at 5:44pm out of VANDENBERG,AFB...The live webcast online will begin at 5:24pm on the website below.

https://www.ulalaunch.com/missions/delta-iv-nrol-71
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Old 12-19-2018, 07:27 PM
 
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This launch is for 12/19/18 to avoid any confusion with the schedule.
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Old 12-19-2018, 07:49 PM
 
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UPDATE:

Launch has been scrubbed because of a leakage
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Old 12-20-2018, 01:29 AM
 
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Mods please delete this thread....Thank You !
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Old 12-20-2018, 10:30 PM
 
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Well its supposed to be rescheduled for the 30th right? Just repost then and it might help remind some to watch for it--- this launch has me worried- it just seems like they don't really have their act together- I hope this next break will help them fix the issues and yet stay cautious and not take chances-
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Old 12-21-2018, 02:43 AM
 
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Yup I can just repost it,and yeah it's rescheduled for December 30th,but if it's not a weather issue it's a mechanical problem going on...Hopefully everything goes as planned on the 30th.

Quote:
Originally Posted by TCROX View Post
Well its supposed to be rescheduled for the 30th right? Just repost then and it might help remind some to watch for it--- this launch has me worried- it just seems like they don't really have their act together- I hope this next break will help them fix the issues and yet stay cautious and not take chances-
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Old 12-21-2018, 10:17 AM
 
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If it's a real hydrogen leak (and not just a sticky valve), it's going to take a LOT longer than 9 days to fix. A leak in the plumbing is weeks and probably a rollback from the pad. A leak in the tank is months. Probably a complete replacement or overhaul of the entire booster, which would likely have to be done in the factory, not in the pad service building.

Even then, I wouldn't bet on it flying. They've fueled and de-fueled the vehicle TWICE now. The thermal stresses from the first fueling/emptying cycle is likely to have cracked the hydrogen tank (or possibly fowled up the plumbing) causing this leak. The second fueling/emptying cycle might do the same to the OTHER two booster cores.

This is a good reason NOT to use more cryogenic propellants than you have to. SpaceX uses kerosene, which is liquid at room temperature. They also use LOX, but O2 is a MUCH bigger molecule than H2, so it's easier to contain and less likely to develop serious plumbing/tanking leaks.

Of course, the SLS (also majority-built by ULA) is going to continue to use cryogenic fuel and oxidixer, since they wanted to repurpose the "quasi-reusable" old SSME hardware to the expendable RS-25--rather than pay for the development of a purpose-built engine--(all of which is dumb for a whole 'nother slew of reasons) so expect a LOT more of this.

Or maybe not. Maybe ULA will just fold when the Falcon-9, Falcon Heavy and BFR (and investigations into corrupt contract assignments) take every single contract away from ULA and award it to the low-cost launchers.

I don't work for SpaceX, I wasn't even a fan when they were first putting rockets in the drink (I worked for their competition back then), but the writing is now on the wall. We've got a dinosaur rocket from a dinosaur company sitting leaking on the pad at VAFB, and we all know what happened to the dinosaurs.
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Old 12-21-2018, 10:27 AM
 
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Great points- I have a feeling of foreboding if this rocket does indeed lift off. I am hopeful that it goes off without a hitch but ......
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